After the alliance of single source, the external environment of Liao country changed, domestic contradictions became increasingly tense, and politics also changed, which led to the internal division of Liao country, so its decline was beyond doubt.

The agreed place of "Yuan Dynasty Alliance" is now Puyang City, Henan Province. During the Northern Song Dynasty, Liao was the greatest enemy of the Northern Song Dynasty. Since the signing of the Single Source Alliance, the large-scale war between Liao and Song Dynasty ended and the two countries became brother countries. Liao country is in a strong position in the north and often sends troops to harass Song country. Most people are scared. Song Zhenzong and the army ministers discussed the desire to motivate the soldiers by personal expedition. Sure enough, the people saw the usefulness of the emperor, and the floating heart immediately calmed down. After Song Zhenzong arrived in Liao country, he went to inspect it himself. Not only that, he also killed the commander of the Liao army with a trick. When the Liao army saw it, it sent messengers to make peace with the Song Dynasty, which soon ended the war. After the death of the general, Liao gave up the idea of invading the south and signed a contract with the Song Dynasty.

Song and Liao countries entered a peaceful period for many years, but all this quietly changed in the late Northern Song Dynasty. At that time, the Jurchen tribe became more and more powerful and launched a war against Liao.

The Union of Single Sources was signed in the Northern Song Dynasty, which was conducive to the military action of Liao. This is a special case of enlarged size. It effectively prevented the occurrence of mantis. After the signing of the "Temple League", the military expenditure caused by hostility in the Song-Liao border decreased, which brought many benefits every year in the Northern Song Dynasty.

Since the signing of the "Yuanmeng" between Liao and Song Dynasties, there has been almost no war between Song and Liao Dynasties in one hundred years. The territory of Liao Dynasty and Northern Song Dynasty almost reached the peak in history. However, with the rise of the Jurchen nationality, this calm began to be broken. In A.D. 1 122, with the attack of the State of Jin, the emperor of Liao was on tenterhooks every day, always feeling that the capital was in danger, so the emperor fled and the people were in chaos. In this way, Liao country fell into the dilemma of national subjugation from a rich and powerful country.